On Monday 25 August 2008 18:59:07 Bob Sanders wrote: > Dan Mills, mused, then expounded: > > Wireless power transmission by low frequency resonant coupling **IS** a > > useful trick in some circumstances (I have seen it used to charge hand > > lamps for use in explosive atmospheres for example (Well over ten years > > back)), and in intels case could be used to for example power a wireless > > mouse or charge a phone, but you can bet there would be a handshake > > between the device and the charging pad prior to RF being applied. > > About 10 yrs ago, I worked for a company that made a transponder that > mounted on the bottom of a locomotive and communicated with an RFID > r/w tag that was mounted on the sleeper between the rails. > > The transponder had a low freq - 125 KHz, loop that sent power to the > tag, which woke up and converted the power to DC, approx. 15mw to power > the tag. Data communications took place at 2.4GHz. I forget if they > went to England or France, but they may still be in use today.
These RFID techniques are still very much in use today. sincerely, Marije _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
